I've got a system that ran cleanly on Ubuntu 10.04 LTS.
Upgrading to 12.04 LTS / 12.04.1 LTS / 12.04.2 LTS has been unpleasant and unsuccessful.
Install goes cleanly and I have installed as follows:
- / on lvm lv backed by by mdadm raid 1 pair /dev/md0 (/dev/sda1, /dev/sdb1) ext4 0.90 metadata
- /boot on lvm lv backed by mdadm raid 1 pair /dev/md1 (/dev/sda2, /dev/sdb2) ext4 0.90 metadata
- swap on lvm lv backed by mdadm raid 1 pair /dev/md2 (/dev/sda3, /dev/sdb3) swap 0.90 metadata
- /data on lvm lv backed by mdadm raid 5 set /dev/md3 (/dev/sd[cdefghijkl]1) xfs 1.2 metadata
After install I boot for the first time from the system. I get the grub2 menu and can pick either normal or recovery mode and the behaviour is the same:
It seems that my second disk controller is slow to start up and/or mdadm takes a bit longer to assemble /dev/md3 and this is detected as a failure.
Even though i (try to) respond affirmatively to the 'start degraded array' prompt, i always land in the busybox prompt.
If I start in recovery mode I see /dev/md3 boot up completely after the system has moved past the 'start degraded array' prompt.
I see that there are issues with 12.04, one post captioned this way: DANGER - DO NOT USE UBUNTU 12.04 IF YOU HAVE ANY SOFTWARE RAID
Is the problem solved in 12.10, or are there other workarounds available?
thanks for any suggestions... Brad